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Room temperature ferromagnetism in un-doped amorphous HfO2 nano-helix arrays |
Xie Qian (谢谦), Wang Wei-Peng (王炜鹏), Xie Zheng (谢拯), Zhan Peng (战鹏), Li Zheng-Cao (李正操), Zhang Zheng-Jun (张政军) |
The Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China |
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Abstract Amorphous HfO2 nano-helix arrays with different screw pitches were fabricated by the glancing angle deposition technique. Room temperature ferromagnetism was achieved in this undoped amorphous HfO2 nanostructure, which is attributed to singly charged oxygen vacancies. The different magnetic behavior and photoluminescence in flat film and nano-helix arrays originate from the distinction of defect components. This study could facilitate the understanding of ferromagnetism origin in undoped HfO2, it also suggests a possible way to alter the intrinsic defects in amorphous HfO2.
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Received: 04 September 2014
Revised: 18 December 2014
Accepted manuscript online:
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PACS:
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75.75.-c
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(Magnetic properties of nanostructures)
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75.75.Cd
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(Fabrication of magnetic nanostructures)
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68.55.Ln
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(Defects and impurities: doping, implantation, distribution, concentration, etc.)
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68.35.bj
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(Amorphous semiconductors, glasses)
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Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 51372135 and 61176003) and the Tsinghua University Initiative Scientific Research Program, China. |
Corresponding Authors:
Zhang Zheng-Jun
E-mail: zjzhang@tsinghua.edu.cn
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About author: 75.75.-c; 75.75.Cd; 68.55.Ln; 68.35.bj |
Cite this article:
Xie Qian (谢谦), Wang Wei-Peng (王炜鹏), Xie Zheng (谢拯), Zhan Peng (战鹏), Li Zheng-Cao (李正操), Zhang Zheng-Jun (张政军) Room temperature ferromagnetism in un-doped amorphous HfO2 nano-helix arrays 2015 Chin. Phys. B 24 057503
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